个人项目介绍2：地球卫星篇

项目需求：

在项目中显示三维地球及主要城市标注，接收服务端发来的实施卫星数据，显示卫星姿态角，陀螺角，飞轮等数据；可自定义模拟产生更多卫星轨迹；可模拟显示卫星躲避陨石动画；可展示卫星模型，并可以爆炸效果显示。

要求：以websocket方式链接，保证实时性。

最终实现：完成以上项目要求，既能对接实际数据又提供了本地卫星数据发送客户端，实现单机模拟效果。

个人网站demo显示效果如下（卫星模型较大，个人网站网速限制，请多等待一会或多刷几次）：

显示卫星爆炸图（网速原因可能加载不出来，或很慢）

卫星多轨道模拟

个人网站地址：

http://47.96.130.245:8080/satellite/index.html

商务合作：

技术实现介绍：

1.threejs引入

import * as THREE from '../build/three.module.js';
import { OrbitControls } from '../js/jsm/controls/OrbitControls.js';

2.初始化 renderer, camera, scene, light, controls

	function initRenderer() {
		renderer = new THREE.WebGLRenderer( { antialias: true, alpha: true } );
		renderer.setPixelRatio( window.devicePixelRatio );
		renderer.setSize( width, height );
		const containerDom = document.querySelector( '#container' );
		containerDom.appendChild( renderer.domElement );
	}

	function initCamera() {
		camera = new THREE.PerspectiveCamera( 45, width / height, 1, 10000 );
		camera.position.set( -2, 27, 15.5 );
		camera.lookAt( 0, 0, 0 );
		camera.up.set(0, 0, 1);
	}

	function initScene() {
		scene = new THREE.Scene();
		scene.background = new THREE.Color( 0x020924 );
		scene.fog = new THREE.Fog( 0x020924, 200, 1000 );
		window.scene = scene;
	}

	function initLight() {
		const ambientLight = new THREE.AmbientLight( 0xcccccc, 1.1 );
		scene.add( ambientLight );
		let directionalLight = new THREE.DirectionalLight( 0xffffff, 0.2 );
		directionalLight.position.set( 1, 0.1, 0 ).normalize();
		let directionalLight2 = new THREE.DirectionalLight( 0xff2ffff, 0.2 );
		directionalLight2.position.set( 1, 0.1, 0.1 ).normalize();
		scene.add( directionalLight );
		scene.add( directionalLight2 );
		let hemiLight = new THREE.HemisphereLight( 0xffffff, 0x444444, 0.2 );
		hemiLight.position.set( 0, 1, 0 );
		scene.add( hemiLight );
		directionalLight = new THREE.DirectionalLight( 0xffffff );
		directionalLight.position.set( 1, 500, - 20 );
		directionalLight.castShadow = true;
		directionalLight.shadow.camera.top = 18;
		directionalLight.shadow.camera.bottom = - 10;
		directionalLight.shadow.camera.left = - 52;
		directionalLight.shadow.camera.right = 12;
		scene.add(directionalLight);
	}

	function initControls() {
		controls = new OrbitControls( camera, renderer.domElement );
		controls.enableDamping = true;
		controls.enableZoom = true;
		controls.autoRotate = false;
		controls.autoRotateSpeed = 2;
		controls.enablePan = true;
	}

3.初始化星空和地球

function initPoints() {
		let texture = new THREE.TextureLoader().load( '../imgs/gradient.png' );
		const positions = [];
		const colors = [];
		const geometry = new THREE.BufferGeometry();
		for (let i = 0; i < 10000; i ++) {
			let vertex = new THREE.Vector3();
			vertex.x = Math.random() * 2 - 1;
			vertex.y = Math.random() * 2 - 1;
			vertex.z = Math.random() * 2 - 1;
			positions.push( vertex.x, vertex.y, vertex.z );
			let color = new THREE.Color();
			color.setHSL( Math.random() * 0.2 + 0.5, 0.55, Math.random() * 0.25 + 0.55 );
			colors.push( color.r, color.g, color.b );
		}
		geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
		geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
		let starsMaterial = new THREE.PointsMaterial( {
			map: texture,
			size: 1,
			transparent: true,
			opacity: 1,
			vertexColors: true, 
			blending: THREE.AdditiveBlending,
			sizeAttenuation: true
		} );
		stars = new THREE.Points( geometry, starsMaterial );
		stars.scale.set( 300, 300, 300 );
		scene.add( stars );
	}

	function initEarth() {
		// 地球
		globeTextureLoader.load( '../imgs/earth.jpg', function ( texture ) {
			let globeGgeometry = new THREE.SphereGeometry( radius, 100, 100 );
			let globeMaterial = new THREE.MeshStandardMaterial( { map: texture,side:THREE.DoubleSide } );
			let globeMesh = new THREE.Mesh( globeGgeometry, globeMaterial );
			group.rotation.set(Math.PI/2, 0, 0 );
			group.add( globeMesh );
			scene.add( group );
		} );
	}

4.显示效果